沥青混合料渗水特性的试验研究

Experimental Study on Permeability Characteristic of Asphalt Mixture

渗水是沥青路面出现早期损坏的主要原因之一,通过渗水原理及试验方法的分析研究,定量分析了多种因素对不同类型沥青混合料渗水特性的影响规律.结果表明:空隙率、混合料类型及级配、集料最大公称粒径与结构层厚度对沥青混合料渗水特性有较大影响.集料最大公称粒径与混合料空隙率越大、混合料级配越粗、结构层厚度越小,沥青混合料就越容易渗水.与传统悬浮密实型沥青混合料相比,SMA混合料渗水特性更易受空隙率影响.成型方式在混合料空隙较大时对其渗水特性有明显影响,旋转压实方法可以提高沥青混合料的抗水损害能力.

Excessive permeability are responsible mainly for early damage of asphalt pavement,quantitative analysis was made to elucidate the rule of influence of various factors on permeability of asphalt mixture.The results show that air void,types and gradations of mixture,nominal maximum aggregate size（NMAS） and thickness of mixture have important influence on permeability.The bigger NMAS and the air void,the more coarse gradation and thinner structure mean the bigger permeable possibility for asphalt mixtures.Comparing with the conventional dense mixtures,the SMA mixtures are more likely to be impacted by the air void.The effects of molding methods are obvious only when the air void is high,and the gyratory compaction can improve the performance of asphalt mixtures under the effects of water.